Research Guides

A complete guide to peptides — definition, types (collagen, bioactive, neuropeptides, hormones), how they work, and what they are used for.

An introduction to research peptides — what they are, how they work, and how they differ from pharmaceutical drugs.

How peptides work as biological signaling molecules — receptor binding, signal transduction, and the six main research categories.

Step-by-step guide to peptide reconstitution, injection technique, and storage for laboratory research.

Complete step-by-step protocol with concentration calculations, storage guidelines, and troubleshooting.

What collagen peptides are, Types I/II/III, clinical evidence for skin, joints & bone, bovine vs. marine sources, and dosing guidance.

The chemistry of peptide bonds — definition, formation mechanism, partial double-bond character, and why it matters for research peptide stability and administration.

How peptide therapy works as a clinical modality — FDA-approved applications, investigational uses, and how it differs from self-administered research use.

Purity standards, receptor selectivity, and a compound-by-compound safety profile for the most researched peptides.

Regulatory status of research peptides in the US, UK, Canada, Australia, and WADA compliance for athletes.

The biochemical and mechanistic differences between peptides and anabolic steroids — structure, receptors, and HPTA effects.

How to evaluate research peptide suppliers — COA documentation, HPLC purity standards, and red flags to avoid.

Adverse effects of research peptides by body system — endocrine, cardiovascular, injection site, and compound-specific risks with severity ratings.

Which peptides have FDA approval, which don't, what the 2023 compounding guidance changed, and what FDA approval actually means.

Melanocortin receptor agonist — mechanism, FDA warning history, comparison with bremelanotide (PT-141), side effects, and regulatory status by jurisdiction.

GHRH analogue with a unique FDA approval history (Geref, 1997–2008) — mechanism, comparison with CJC-1295 and Ipamorelin, and research applications in GH deficiency and aging.

The only FDA-approved GHRH analogue — mechanism, Phase III visceral fat reduction data, dosing protocol, and comparison with sermorelin and CJC-1295.

The definitive reference for the GHRH analogue peptide family — sermorelin, CJC-1295, and tesamorelin compared across mechanism, half-life, FDA status, and stacking protocols.

The definitive reference for the GHRP family — Ipamorelin, GHRP-2, and GHRP-6 compared across GHS-R1a selectivity, cortisol co-stimulation, appetite effects, and optimal stacking protocols.

Why combining GHRP and GHRH analogues produces 3–5× greater GH amplification than either alone — GHS-R1a vs GHRH-R signaling, synergy mechanisms, and optimal stacking protocols.

Top-of-funnel guide to the six major research peptide families — GHRH, GHRP, GLP-1, recovery, longevity, and cognitive peptides — with a goal-based decision matrix.

Foundational deep-dive on the GH axis — hypothalamic GHRH and somatostatin, pituitary GH secretion, hepatic IGF-1 production, negative feedback, and peptide entry points at each node.

Complete reference for the longevity peptide family — Epithalon, MOTS-c, SS-31, NAD+, and GHK-Cu compared across mechanism, telomere biology, mitochondrial function, and stacking protocols.

The gold-standard GHRP — GHS-R1a mechanism, selective GH release without cortisol or prolactin elevation, stacking with CJC-1295 and Sermorelin, and clinical evidence summary.

How GHRH analogues (sermorelin, CJC-1295, tesamorelin) stimulate natural GH release via the pituitary, preserve feedback mechanisms, and differ from exogenous GH replacement.

40+ years of research on this immune-modulating 28-amino-acid peptide — T cell regulation, toll-like receptor expression, vaccine response, and clinical safety profile.

Endogenous tripeptide that modulates 4,000+ genes — collagen synthesis, hair growth, wound healing, and systemic anti-aging research with 4 PubMed citations.

Mechanism-based review of Semax, Selank, Dihexa, BPC-157, NAD+, and Epithalon — BDNF/NGF upregulation, synaptogenesis, and neurotransmitter modulation with 4 PubMed citations.

Mechanism-based ranking of the most researched fat loss peptides — GLP-1, AOD-9604, CJC-1295, and more.

Generation-by-generation breakdown of GLP-1, GLP-2, semaglutide, tirzepatide, and retatrutide.

Complete reference hub for the GLP-1 family — semaglutide, tirzepatide, retatrutide, and AOD-9604 with generation comparison table and research use case matrix.

Phase II NEJM data analysis for the triple agonist with 24.2% weight loss at 48 weeks.

The mitochondria-derived peptide that activates AMPK and mimics exercise — mechanism and research.

Evidence-ranked guide to the most researched peptides for anabolic signaling and muscle hypertrophy.

An overview of the GH axis, IGF-1, and how peptides influence muscle protein synthesis.

Side-by-side comparison of the two most researched recovery peptides — mechanisms, evidence, and use cases.

Research-backed guide to the most studied longevity peptides — Epithalon, GHK-Cu, Thymosin Alpha-1, and more.

How DSIP, Selank, and other peptides influence sleep architecture, cortisol, and overnight recovery.

Mechanism-based review of peptides most relevant to women's health — skin collagen, body composition, bone density, hormonal balance, and cognitive function.

Research-backed guide to peptides most relevant to male physiology — testosterone axis, muscle hypertrophy, visceral fat reduction, injury recovery, sexual health, and cognitive performance.

The canonical GH-axis stack — how GHRH and GHRP receptor complementarity produces synergistic GH release.

Mechanism-based analysis of the 6 most researched peptide combinations — synergy rationale and evidence levels.

Complete mechanistic guide to all 5 Purgo Labs blend formulations — synergy rationale, pathway analysis, and evidence tiers for Wolverine, CJC/Ipamorelin, Glow Complex, KLOW, and Selank/Semax Blend.